Drill for oil-wells.



S. J. M. COX.

DRILL FOR OIL WELLS.

APPLICATION FILED MAR. 1'3. 1913.

1,179,284. Patented Apr. 11, 1916.

OMA, ASSIGNOR OF ONE-HALF TO JOSEPH D, BOTH OF BRISTOW, OKLAHOMA.

' DRILL ron oIL-wELLs;

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed March 13, 1913. Serial No. 754,045.

. To all whom it may concern:

Be it known that I, SEBERON J. M. Cox, a citizen of the United States,residing at Bristow, in the county of Creek, State of Oklahoma, haveinvented certain new and useful Improvements in Drills for Oil- Wells;and I do hereby declare the followingto be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

The present invention is directed to improvements in drills for oilwells or the like, and has for its object to so construct a device ofthis character that the bits are permitted to contract when in the usualwell tube, and to expand at the desired point.

A further object of the invention is to provide a device of this typeexceedingly simple in construction, efficient in operation, and onewhich may be manufactured at a minimum cost. I

With these and other objects in view, this invention resides in thenovel features of construction, formation, combination and arrangementof partsto be hereinafter more fully described, claimed and illustratedin the accompanying drawing, in which:

Figure 1 is a front view of the device. Fig. 2 is a side elevation. Fig.3 is a sectional view on line 33 of Fig. 2. Fig. 4 is a similar view online 4-4 of Fig. 1.

Referring to the drawing, the numeral 1 designates the stock, which iscylindrical in cross section and has its upper end provided with aconical extension 2 for threaded engagement with the lower end of theusual drill rod, the lower end of said stock being provided with a drilledge 3. I

Formed near the lower end of the stock 1 are oppositely disposedrecesses 4:, the bases of which are provided with sockets 5, the purposeof which will appear later. Each recess 4 has its base formed withshoulders 6 which engage the lateral extensions 7 carried by the bits 8.The bits 8 are formed with cutting edges 9, which may be of anyconfiguration, to suit work of different classes, and extend the widthof the bit and extensions 7. The bits are pivotally supported in therecesses by set screws 9 which pass through perforations 10 formed inthe stock 1. The lower ends of the bits 8 are H formed with beveledfaces 11, which have their lower edges adapted to engage the beveledwalls 12 formed in the lower ends of the recesses 4, thus limiting theswinging movement of the bits. The inner faces of the bits are formedwith sockets l3, and in which the outer ends of the coil springs 14engage, the inner ends sockets 5, thus normally holding the bitsexpanded so that their cutting edges 9 will be positioned slightlybeyond the plane of the outer surface of the stock 1 so as to insureproper cutting.

of which engage the Diagonally arranged ducts 15 are formed in the stock1 and have their opening into the lower ends of the recesses 4:, saidducts serving to allow earth, or particles of stone to pass from therecesses so as to not hinder the effectual operation of the bits.

From the foregoing description it will be seen that a drill has beenprovided with bits which may be readily contracted for entering theusual Well tube, and will automatically expand when reaching the desiredpoint of operation.

What is claimed is:

In combination, a stock provided at its upper end with meansforattachment to a rod and at its lower end with a cutting face, the saidstock being provided intermediate its ends with longitudinally disposedrecesses, a longitudinally disposed-shoulder formed to project into eachrecess at the lateral sides thereof adjacent its bottom wall, each ofsaid recesses being provided with an upwardly and outwardly inclined endwall, a bit of substantially the same thickness and width as the depthand width of said recess pivoted at its upper end in each of saidrecesses to be wholly 'incl'osed therein, length than the said recessesand being inclined upwardly and outwardly from the extreme lower edgethereof, longitudinally disposed extensions on the end faces of each ofsaid bits for engagement with said shoulthe said bits being slightlyless in.

upper ends ders, the bottom wall of each recess and the adjacent faceofsaid. bitsbeing provided with: alined sockets disposed intermediatethe lateral edges of said sockets and bits,

springs seated at ii if eppesite ends in Efiiii.

end communicating W1th the exterior of said socket by an outwardlyinclined duct.

In testimony whereof, I afiix my signature in the presence of twoWitnesses.

SEBERON J. M. COX.

W'itnesses:

W. R. Fox, A. L. RAnDALL.

